Abstract: This invention discloses a model test device and method for curtain grouting and excavation of tunnels in high-temperature, water-rich and weak strata, comprising weak strata simulation system, working condition simulation system, curtain grouting system, and monitoring and data acquisition system. The weak strata simulation system is the main box used to fill the soft soil. The working condition simulation system includes a high geothermal simulation system, a water pressure simulation system with stepwise loading of water pressure and volume, and a three-dimensional confining pressure simulation system with stepwise controllable loading of confining pressure. The invention can realize the whole test process simulation of grouting reinforcement and excavation of tunnels in weak strata effectively under the action of confining pressure and geothermal heat, and it has a positive reference effect on actual soft stratum tunnel curtain grouting and safe excavation.

Abstract: An equipment and application method for sinkage detection and active escape of deep-sea mining vehicle, comprising: the sinkage detection and warning devices and the self-escape equipment. The sinkage detection and warning devices are installed on the left and right sides of each track of the deep-sea mining vehicle, and it monitors the contact conditions between the tracks and the sediment, and the distance from the bottom of the track to the device is measured. The self-escape equipment comprises the active interactive grouting system, which connects to intelligent steering and retractable grouting heads. The intelligent steering and retractable grouting heads are also located on the left and right sides of each track. This invention can detect the complex driving environment of the seafloor automatically and combine the existing grouting technology and materials to achieve active grouting escape in case of excessive sinkage.

Abstract: This invention discloses a model test apparatus and method for shield post-wall grouting and tube sheet uplift under high water pressure conditions, comprising main body box, tension apparatus, shield system, grouting system, ground stress loading system, water injection system, and monitoring system. The main body box comprises the shield shell system and model soil inside. The ground stress loading system and water injection system realize the simulation of the complex underground soil and muddy water environment by applying stress and water pressure to the model soil inside the main box. While the tension apparatus makes the shield shell moving forward, the grouting system injects slurry into the gap between the shield shell and the tube sheet. The integrated model test of visual shield grouting and tube sheet uplift, the real-time multi-physical field responses, and the longitudinal deformation mechanism have been realized and revealed under high water pressure conditions.

Abstract: A synchronous single-liquid grouting slurry, its technology and application for large diameter shield engineering under water-rich, high-pressure and weak soil strata conditions, comprising raw materials: 1050-1200 parts of gold tailing, 420-480 parts of silicate cement clinker, 220-240 parts of fly ash, 45-120 parts of waste clay brick, 65-95 parts of slag, 25-45 parts of limestone tailing, 70-80 parts of steel slag, 30-45 parts of silica fume, 15-22 parts of desulfurized gypsum, and 9-15 parts of quick-setting and early-strength composite additive. The invention controls the d50, d85 and d95 of the material particles as 35-40, 42-48 and 50-55 ?m, respectively. Gold tailing with the particle size of 120-600 ?m being used as the fine aggregate, their volume fractions are 40-60%. The slurry production technique, comprising crushing-sieving-superfine ball milling-homogenization-particle size classification-variable speed mixing being developed.

Abstract: The invention discloses a mechanical torque converter (100) having a casing (6), an input shaft (2) entering casing (6) and rotatable within the casing (6). An output shaft (5) exits casing (6) and is rotatable within casing (6). A gearbox (1) is located within casing (6) and coupled to input shaft (2). An escapement device (3) is within casing (6) and coupled to gearbox (1) to brake gearbox (1) under low speed and a clutch (4) co-operates with output shaft (5) and gearbox (1).

Abstract: A calcium-rich powder possessing therapeutic properties produced by washing and sterilising the shells of molluscs taken from an uncontaminated marine environment, heating said washed and sterilised shells to a temperature of between 1000° C. and 2000° C. for a period of at least 10 hours, reducing the temperature of the resultant material to room ambient temperature over a period of at least 24 hours, and then crushing said resultant material to a fine powder.

Abstract: The invention discloses a mechanical torque converter (100) having a casing (6), an input shaft (2) entering casing (6) and rotatable within the casing (6). An output shaft (5) exits casing (6) and is rotatable within casing (6). A gearbox (1) is located within casing (6) and coupled to input shaft (2). An escapement device (3) is within casing (6) and coupled to gearbox (1) to brake gearbox (1) under low speed and a clutch (4) co-operates with output shaft (5) and gearbox (1 ).